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Buffer-aided relay selection for cooperative NOMA in the internet of things

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journal contribution
posted on 2019-07-08, 15:00 authored by M Alkhawatrah, Y Gong, G Chen, S Lambotharan, JA Chambers
The nonorthogonal multiple access (NOMA) well improves the spectrum efficiency which is particularly essential in the Internet of Things (IoT) system involving massive number of connections. It has been shown that applying buffers at relays can further increase the throughput in the NOMA relay network. This is however valid only when the channel signal-to-noise ratios (SNRs) are large enough to support the NOMA transmission. While it would be straightforward for the cooperative network to switch between the NOMA and the traditional orthogonal multiple access (OMA) transmission modes based on the channel SNR-s, the best potential throughput would not be achieved. In this paper, we propose a novel prioritization-based buffer-aided relay selection scheme which is able to seamlessly combine the NOMA and OMA transmission in the relay network. The analytical expression of average throughput of the proposed scheme is successfully derived. The proposed scheme significantly improves the data throughput at both low and high SNR ranges, making it an attractive scheme for cooperative NOMA in the IoT.

Funding

This work was supported by EPSRC grant number EP/R006377/1 (“M3NETs”).

History

Citation

IEEE Internet of Things Journal, 2019, 6 (3), pp. 5722-5731

Author affiliation

/Organisation/COLLEGE OF SCIENCE AND ENGINEERING/Department of Engineering

Version

  • AM (Accepted Manuscript)

Published in

IEEE Internet of Things Journal

Publisher

Institute of Electrical and Electronics Engineers (IEEE)

eissn

2327-4662

Copyright date

2019

Available date

2019-07-08

Publisher version

https://ieeexplore.ieee.org/document/8667333

Language

en

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